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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad9c7e0c374fca8dcf29023e34dbc1ae6ac34d5e09d3b6dab42a7e27e865ba8' 
  AND token = 'hW9oMmb3Khvv+g656epw3HCwlRdrD4HiUxd+IMsBfyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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