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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19e984c8ac247dfd46718fb04353a3eb80ea41fb4c630f1473c055cb1f25e10' 
  AND token = 'xGI8aVIopFVqxekBa3mugN7iBLTJVooY4kGHzM/YHMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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