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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5812dbd557f2f8df9aa126c032f175a2ba80aab610ac889d3a10dcb618b580' 
  AND token = 'nFsyeMjZ7NCil4ziUUtSLGhRK3dzmMo9hyoJ/BnIn6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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