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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2004bc46a9a1be1c65247a03fd9c5400d2344995902694f4a00f8a71577da52' 
  AND token = 'DAXqZlED6k14G8IGWjLurQ0EmSMdpaykUXBsy2AqQFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}