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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5438f8436dc3fabc88796fc0da7d968fe51abf7b049c6d8afea278e5fbcc0b6' 
  AND token = 'prSZg8Gb33jRMTDl6EOIN7VP5S0OD9/tg2HwOsmGFdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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