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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6b560bb1fee44fb7a8b2afb0a5268bbb1f62a5b07f66594abf3619ded37f9e' 
  AND token = 'YjdhQXNWmK30FCa+nNgrxYtgudEfmWQQHhTOPPX8y/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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