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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fdb934f5a9791c96ecb213e515c461af3907cf53cd72e31776c4fbbc4359f4' 
  AND token = '4MnaxPx0FwUjP8oxH0rggy7n/i/8QTYZpIB0YoVle8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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