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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2908b1b50eae7c028e24dbf353399934a82b55cdc7c2c23f76398aae46ebe2' 
  AND token = 'ghniyvCVlG7RFcsckYLgbnM89Bqf5bSxfS866UY7luY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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