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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196f1ea2e2fc3871c805ffa9fef757809aa5149d079f394a287f1ee0ed27640f' 
  AND token = 'N9iRRuxE8AU4aMq8PdxiX3OaqwCKey9eLbykOHXrO6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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