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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9b9bbe0e3824b309cfc4855628cd1cbfb20ada03dcdd55ac321a2a5ccc1214' 
  AND token = 'WyjQP2sKA+JYKfjAaSSf3sKrO4l01w/dciH/owDE72s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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