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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ff71d0e949082172599cb835f1f0ee6b07010458006a1c8e9e86d9b90e4135' 
  AND token = 'CZLQT5WYRMa8WvSit1txvm85K0NzMrIWWLYhPz9Hgjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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