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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986b7b3caeab24e8af0a0e082a5b90464bd77943f3604594fd177af09bfb2fcb' 
  AND token = '7RIkqgExX4jFzg8hKfWDFY2l3sXejqiXDfKxjJvy3/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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