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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f047d49267fa9cf983e9c3bcbef14c962cc23c863b1a72a72ee7a61cc5599253' 
  AND token = 'bhyPGYmN6UWsLjahodMUYCWUfwy+8xiFCejCyoZphLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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