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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eede8d6f90e28625eb0bb835a73fd6cf36f455149118bea3479b15890af6758' 
  AND token = 'N9s6d9HSeFYc0oj3SECCTM4rDUmuXB5h2RhOE47sMkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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