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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f11cf4f386017d76c531942f220e7f6ec5fde6e25c6d2e0457d8ebd2dd5c62' 
  AND token = '6yP6oM5zMHwFc/kfi3F/tqNvFeqpa9Q/W72NBEZARkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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