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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528f3c12ae9eb124bac00b629b97c46dbc009693145948b15ac90824fb9266f5' 
  AND token = '1WJ30a6RWpCqVQTgksuTvoIqXyyIL6O2IxzELdEoK6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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