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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac3d9c3081a533014e95e0b4337d9af7b1d2d493069508a9c249b61b3ff19f4' 
  AND token = '14z2iiH9nXBfsTgVshFgSJtpkEs/3Mi5i2ylap9tMcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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