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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd736c1b7e33cfb7a65594aa706a31b4e4478de9b305a6a70d65842fe2e9baa72' 
  AND token = '3dVWFtOygyNs82dwLRPH1STeBssE5h2dBoqQ5NtMDjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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