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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a5897f7fc7eaed1b1b9b103c7cc5de3ee89032ec26cf9c4afba864c4adb5bd' 
  AND token = 'kna/sGK/HIzjDDKoVVnkMydZ+dMTgyjhuO5ozuiHg4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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