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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431959ddb4517699e53ea93855aebb7e1d0a60211ddaee773bcbf2aab12b62d4' 
  AND token = 'TQIMcwkClCfgoBX+udsPlFKocoZ8Ltmlepkjs9KlqYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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