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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc4025b487df064e5a35473e4c076e078e64c72b6fdb5e6cfabf237dbdce4e4' 
  AND token = '4iq/hbQANUwSOSj03Whgh4sFe55p2VZ+r83WwRciEwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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