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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cfa4da4fb4705d94cb1397459f1acd3559c604c17dec3a546d7e3315396d7e' 
  AND token = 'YLsWZp/u+w9jTgpQy8eSJBhDAB5wxjpjZ+2Ztx01rNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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