SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01781c1e88f910edae225eb0833bb31ab248203c850f974b34f24be8ab9937e' 
  AND token = 'Tp65D3OPC1iMTrieafzoBi2VIjiz+Hh7jL3SK9dh6n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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