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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe96d8c9cd7addd54350c6e345c489db53ab90c0da0e7f1ffae67492f20d0a38' 
  AND token = 'G1+Za7MqVarmTp4X7cJGdW9EEp8CzxWK/Pv4lj3YJ4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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