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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5a1df21cdf67665549bc8f11d4ea90d1f34d8715a4ea0fe71dfd34b56708c9' 
  AND token = 'yJayOA3sgQhLe1aq70wm06ratyfRB4lLH1EayQGLznA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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