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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8a85ae343db05e31b072e1aa1252385517625c3e84ea0a8088d7dd934159fc' 
  AND token = 'riL1WqRFChYLv1tUoCS+nPG+CrrDcvuhz+aN/cwywIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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