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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92a672f3c306b609f561eec482b1864c4dec4d2bda4df80876cdb0b008a38bf' 
  AND token = '4bTGUUR05RQ+xYi/j9oBQxQo21YnqXc1mBtVKlivyLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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