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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08891fb1035444e4b8d8ed88146556b039f36d26438970424bf98cf5ea706f53' 
  AND token = 'etGN/XPXxUD1zdbdXHSFgfbOhvRz3kJM+UuR/+HFL1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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