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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bab681a6845fc72d212475e2f18326c83ee2c311ff0bc3592346b001b1a1a26' 
  AND token = 'BXUbekHNdqe7gUJfE2d1VCsvJ42S6yXDlguGackXY3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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