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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a98070d25124aae6000403d8b8c844e76cc3f7a0248a10fc14a9d9807b6d42' 
  AND token = '05Gqdgdi1VdtAT8VCYvpE63NhNZXV0JYTGhAYx6Y8Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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