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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff72474396b7a655782a5777177530fed79bae6f3dd47d68d04ff2a776ab19f6' 
  AND token = 'gMmpXFd1/5WTq8tFkfhNeNzpRtyy8kIFzCOmyV1gRi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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