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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4bc5e43f4a5c368fefa4085cc37809a85f12f62e4b136a78e448f6ed7d373c' 
  AND token = 'cKYeyv3xxfiDGApsQXmj9TUMkh+wdpjCXVPt6FuXraA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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