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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48bea0394602fb5a493ce7176892f3a43e3c5a094e069308c3bf367c11c52864' 
  AND token = '0II9APKRmdX0JjSa2dRlupRlNYNX20kmdl7QGQfq+CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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