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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9899cda6f69be21e80e0e7cc63eeea053fe1d33ab94596523e539e6acfb44e' 
  AND token = '84dr65WIyeNYMAR52WEf2MaRIvzOkLPEW9ojkYqynw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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