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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8414d9211dbdd949b00da82f7ff43f003890f67aa10eb195b07696e935977b1c' 
  AND token = 'g4t3JBjBJHR89/k115m3tHSS44jmqh1gMPUEP3CZw48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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