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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdc477e0843641f5665210c7d417ab9f4efb8fda05e66be10d2a90ca2be9858' 
  AND token = 'efa3M8yUUbrx9I/dzlMxcANA5K67x0siJkCvwGhKAn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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