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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b84cad6aaf7a20f2c5e7d69a24b6dd33f0ab6a9a1113c08c1e851b0bb94af8b' 
  AND token = 'sTBlImM9lbnu56tG+Y0O9HTMqvTRgWfdR+fRqL0iQ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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