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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e036c27b5446a0e7aea8013dd8a56fe202a1fd19531bacefba0fd7831cf235bd' 
  AND token = 'SnyHyfsk/JeDyu5pVONo+qwQ+BkVpzPih/QtJIPFn6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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