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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b10e0d955219e93ff06b4da258f9f5eb7765dc527c8e473bfee61bc57a95d26' 
  AND token = 'ivBCh68o5mkjaz2sRVtcBZMTYjK1Go7RWqH0W1OK9YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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