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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a0b0d8eea30ff75ec02d6b603681adb59d2aa6fea174f7325534c143cd30f8' 
  AND token = 'IsIZ/iVGj9f0N/rEC/l0Pr7CT6a9YPDW7eZK+9u2cH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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