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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dc06e7eef9d2f7839b5a9eb9c482d3d7a7c9bcc731b1f43dc830e050a59445' 
  AND token = 'QeGk1TOX70uP60RfwnF2gv5695nUYAR/rt66XwQOuDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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