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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c0a4da6b609d30fe8ed80b645945f64a351090ecf0d4f934c278613431edfd' 
  AND token = 'dIC5E67AHN5HZu6UXGh8AWhoQEh+K1U3ieVFHQbXpgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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