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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd861fb9df303a0ff6437b2f88f95cc01267b45957bfe8a4011f73170a416c3e' 
  AND token = 'lE9V1gf2iH49wK8YIVaqOumoQRISZC1Y8aWnnxdvgLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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