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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d79cdbb77f915ddb5feac729b6453042b4b9c4271d90b8376ee3d5057713c99' 
  AND token = 'nE7MHINccNkPdUdVs8NwpfqyJ117l9zE6Ww1vmCT/Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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