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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5788b906a2b03c4ee999d1cee1c2f58701efecf7a584fd31685d8d508182ca' 
  AND token = '7QeZe8qxRC46LmRFKyELPSa5S7kc1jjt47XWK4ZUtuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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