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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fb16529ddccf618d2cda9bfd0f27810df35ed45f379529d6e97dfbfbfd439c' 
  AND token = 'gq9lE7BK/tS1uUkshh2RoqR87Uw6a5Jb1sNsWT4Vh6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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