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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbb029606fdf65655ba17e9b8c4b863f9f3dbe7e0615b33a67ce6621fad5c67' 
  AND token = 'L7myTQCzAC6818o2iH8U46uHDYg0RuTcpF55QPQelto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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