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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c95dc90dc8fecde13620a896049c323e3c7fd78e1dbc8aec5274867a9693dba' 
  AND token = 'FXdkvQ3j0E1y6aX3unQIKbah/dfeHCMvHYJD8eMCfWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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