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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06f5129513fd6c2326a85f9bdcf738c9f8ffd83108ccf072a643c661faa1063' 
  AND token = 'tMQb76khnjoPPZWl83ch51wyWFVmlxiLSIouNLsUov8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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