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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a703ac343b7eed70f40a1c6619b87f5c3518d07e7cf0cd86272457629b72b960' 
  AND token = '1fKBLISH62L6axwzjFMYZDIkXXohfBwl2ZGl9FeRXhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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