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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7314bad9176beb1cc98f618b7aeb2691c3d866f3ef50ce5f4f1e431ec39927c' 
  AND token = 'T/KZBxZs7y8xCTsHZgFVtNy8e4nZoJoo6Q1hIrDqYDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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