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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea8493cab4e8b5491f30de149ed22b5c8f19a228c402b41b7cffa109e4d22d3' 
  AND token = 'uIqONed7OSXiU/kw35Y+9bh+0XllAH9Xc07Ml6o1f6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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