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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ab389c2c0a379833ea05c285459425aa94522b079c9eba4887b84d73092c6b' 
  AND token = 'NN9bBb9XkiMQ1/2Q0At7b0iswmSB7XrTrj3nEEJ30Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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