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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113e0b0e285733185b995fd098026e588daa543e67d15ef78115139f3a9d2730' 
  AND token = 'aRjhhUBgDDkxOOegKsj9lfPwSgZkE4H7LZHDh3h+jDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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